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to sit up
[phrase form: sit]
01
to change one's position from a lying or reclining position into an upright one
Example
After a long nap on the couch, she suddenly sat up, realizing she had overslept.
The patient in the hospital bed struggled to sit up after the surgery.
02
to stay awake beyond the usual or expected time
Example
I had to sit up late last night to finish my assignment for school.
He often sits up reading a good book until the early hours of the morning.
03
to help a person to move from a reclined position to a seated one
Example
The nurse gently sat up the patient in bed to administer the medication.
After the surgery, it took some assistance for him to sit up and eat his meal comfortably.
04
to pay attention or show interest, especially in a particular topic or conversation
Example
The audience sat up as the guest speaker shared personal anecdotes that captivated everyone's attention.
She began to sit up when the conversation turned to topics related to her favorite hobby.

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